Got a problem whit my internet on linux red hat 7.2!!

I have problem whit connecting to my adsl on linux! I think it is my netvork card that dosent work..(smc ez card 10/100 (smc1211tx)).....how do you install it in linux? i can give you some information if you need it: my proxy is: proxy1.telia.com.....the proxys that shell not be used as proxys is login1.telia.com and 10.0.0.6when i try to log in to the login1.telia.com it says: proxy1.telia.com can not be bla bla.....any help would be great!! i really need it!